CODEWITHSUNDEEP
linuxhuge-pages
ShAd
ShAd

Reputation: 57

Fatal error: hugetlbfs.h: No such file or directory

I'm trying to find value of huge page size using gethugepagesize() function. I found out that hugetlbfs.h library has to be included. When I included the header I got compile error:

Fatal error: hugetlbfs.h: No such file or directory

When I skip including library file and call the function, I get linker error as

undefined reference to `gethugepagesize'

I looked through the post How to get the value of huge page size?. I couldn't get the solution of the post working.

Am I missing something?

Upvotes: 1

Views: 2650

Answers (2)

Iqbal Ahmad
Iqbal Ahmad

Reputation: 1

Try searching for the version of installed libhugetlbfs

rpm -qa | grep -i huge

libhugetlbfs-2.20-8.fc29.x86_64
libhugetlbfs-utils-2.20-8.fc29.x86_64

Then Install the same version of libhugetlbfs dev library.

sudo yum install libhugetlbfs-devel-2.20-8.fc29.x86_64

Upvotes: 0

jww
jww

Reputation: 102256

I get linker error as "undefined reference to `gethugepagesize'" ... Am I missing something?

According to dnf, libhugetlbfs is not provided by Fedora 31.

$ dnf provides 'hugetlbfs.h'
Error: No Matches found
$ dnf provides libhugetlbfs
Error: No Matches found

It looks like you may need to download libhugetlbfs from their repo for Fedora. The old repo is at Sourceforge. The new repo is at GitHub | libhugetlbfs.

According to apt-file, libhugetlbfs is provided by Ubuntu 18. For Ubuntu the header file appears to be part of kernel headers. It looks like the library is part of the libhugetlbfs-dev package on Ubuntu.

$ apt-file find hugetlbfs.h
libhugetlbfs-dev: /usr/include/hugetlbfs.h
linux-headers-4.15.0-1050-oem: /usr/src/linux-headers-4.15.0-1050-oem/include/config/hugetlbfs.h
linux-headers-4.15.0-1059-oem: /usr/src/linux-headers-4.15.0-1059-oem/include/config/hugetlbfs.h
linux-headers-4.15.0-1065-oem: /usr/src/linux-headers-4.15.0-1065-oem/include/config/hugetlbfs.h
...

Also see gethugepagesizes(3) man page and the project's HOWTO.

I'm trying to find value of huge page size using gethugepagesize() function ...

From my reading of the man page, it looks like libhugetlbfs is part of a virtual file system. It may not do what you think (if you are thinking large page sizes on x86 cpu's). But I may be wrong since I have never used the library.

Upvotes: 1

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